Enclosed adjustable impact roof scraping machine



D. CLEMENZI June 5, 1956 ENCLOSED ADJUSTABLE IMPACT ROOF SCRAPING MACHINE 2 Sheets-Sheet l Filed April 21, 1955 INVENTOR.

June 5, 1956 D. cLEMENzl 2,749,103

ENCLOSED ADJUSTABLE IMPACT ROOF SCRAPINC MACHINE Filed April 2l, 1955 2 Sheets-Sheet 2 Fig. 2

@ I'I ",L-.g- El IN V EN TOR.

United States Patent O ENCLOSED ADJUSTABLE IMPACT ROOF SCRAPING MACHINE Dominick Clemenzi, Danvers, Mass.

Application April 21, 1955, Seal No. 502,887

3 Claims. (Cl. 262-13) This invention comprises a new and improved machine for scraping tar and gravel or other materials from a roof preparatory to reconstruction or repair work.

Heretofore such work has been performed by hand inditferently and at considerable expense because it has required great physical strength and skill on the part of the workman. The machine of my invention is power driven and requires only to be moved over the roof area in order to detach and scrape clean the underlying surface. For that purpose it comprises a box-like chassis forming an enclosure within which is mounted a driven tool-carrying shaft with a series of centrifugally operating tools. Upon the exterior of the chassis is mounted a source of power, such as a motor or engine, and supporting wheels. By this construction the debris loosened and thrown up by the operating tools is confined and the operator as well as the motor and the wheels upon which the whole assembly is moved about are safeguarded from flying debris.

An important feature of the invention consists in a chassis of novel shape and construction suitable for the purpose above discussed. The top of the chassis includes a rectangular dome upon which the motor or other source of power is mounted and which affords clearance for the rotation of the centrifugally operating scraping tools. The chassis also includes an inclined shield as its rear wall which is useful in confining the debris thrown up in the operation of the machine and deecting it for later conveulent collection and disposal.

Another important feature consists in provision for adjustment of the effective distance of the scraping tools from the underlying roof surface, or from the plane of wheel base of the machine. As herein shown this is accomplished by mounting one set of wheels on a yoke adjustable within the chassis. Adjusting means for the yoke are located in the top of the chassis and offset from the dome where they can be conveniently reached. Thus adjustment may be made of the effective cutting or scraping plane of the tools without disturbing the driving connections to the tool-carrying shaft.

Still another feature of the invention consists in the construction of the tool-carrying shaft and its related tools. As herein shown the shaft is square in cross section and drilled to receive a series of bolts disposed at right angles to each other. To each end of the individual bolts is secured a chain carrying a solid scraping block and they are arranged so as to scrape a continuous zone of the underlying roof surface, leaving no unscraped streaks after the passage of the machine.

These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawings, in which:

Fig. 1 is a view of the machine in side elevation,

Fig. 2 is a rear View,

Fig. 3 is a view in transverse section on the line 3-3 of Fig. l, and

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Fig. 4 is a sectional view of the tool-carrying shaft on the line 4-4 of Fig. 3.

The machine herein shown may be compared in size approximately to a power lawn mower and is adapted tobe pushed by hand over a at roof from which it is desired to remove roofing material, such as tar and gravel.

The machine comprises a rectangular chassis of heavy sheet steel and has atop 10 from which rises a rectangular dome 11 leaving a wide deck fore and aft'and a narrow deck area at each side, the dome being offset inwardly or laterally from the side walls 12 and 13 as shown in Figs. 2 and 3.4 The rear wall 14 of the chassis is inclined downwardly and rearwardly and acts as a shield and deector for flying debris thrown up by the scraping tools. A shallow front wall 15 completes the box-like enclosure of the chassis.

The chassis is supported upon two pairs of wheels, the rear wheels 16 mounted on ball bearings running on separate spindles projecting in xed position from the side walls 12 and 13, and the front wheels 17 also running on ball bearings on spindles 18 projecting outwardly from the down-turned arms of a yoke 19. The spindles 18 pass outwardly through vertical slots 18' in the side walls. The yoke 19 is adjustably mounted in the chassis by a pair of shouldered bolts 20 which are threaded into the cross member of the yoke and extend upwardly through the forward deck of the chassis. The bolts are provided with bar handles in convenient location at their upper ends and are encircled by springs 22 maintained under compression and acting to prevent free turning of the bolt. It will be understood that by manipulating these bolts the yoke 19 with the rear wheels 17 may be raised or lowered in the chassis and thus the tool-carrying shaft, which is mounted in the chassis, may be adjusted as to its operative position with respect to the plane of the wheel base.

The tool-carrying shaft 23 is square in cross section as shown in Fig. 4 and is fully enclosed within the box-like enclosure of the, chassis. lt is provided at its ends with trunnions by which it is supported in fixed bearings 24 and 24'. The right hand bearing 24, as shown in Fig. 3, is suspended from the dome 11 by bolts 25 and spacing sleeves 26, while the left hand bearing 24 is suspended from the deck 10 by shorter bolts 25' and spacing sleeves 27. The bearings 24 and 24 are thus fixed in the chassis, and are adjusted with it in respect to the plane of the whole wheel base when the yoke 19 is moved up or down.

The square body of the tool-carrying shaft 23 is drilled with twelve bolt holes located alternately at right angles to each other and alternately adjacent to opposite sides of the shaft. A bolt 28 occupies each of these holes and to the opposite end of each bolt is secured a link 29 of a short chain 30 carrying at its outer end a cubical block 31. The inner end links are bolted in ilat condition t0 the adjacent flat face of the shaft, while the other two links and the blocks 31 are freely suspended and fly out in radial direction as suggested in Fig. 4, when the shaft is driven at high speed.

As herein shown a motor 32 is bolted to the roof of the dome 11 and connected by driving belt 33 to a pulley 34 on the right hand end of the shaft 23, the belt 33 passing downwardly from the motor shaft through an opening in the deck of the chassis in reaching the pulley 34. As already suggested, a gasoline engine may be used in place of the motor 32.

A bail 35 of rod stock is bolted to the deck of the chassis at points adjacent to its front and rear ends and is provided with a loop in its upper member substantially above the center of gravity of the machine as a convenient means for hoisting it to the roof to be scraped.

An upwardly and forwardly extending handle 36 is bolted to the rear portion of the deck of the chassis and is provided with a switch 37 for controlling current to the motor 32.

In operation the shaft 23 is driven at relatively high speed, for example, 1700 R. P. M., by the motor and the machine is drawn slowly across the roof from which the roofing material is to be removed. The chains 30 assume straight radial position and the blocks 31 are thrown or dashed violently but yieldingly against the underlying rooting material cutting it away and removing it from the underlying boards as suggested in Fig. l. The spacing and arrangement of the chains and blocks on the shaft 23 are such that the edges of the blocks naturally assume a straight line position and cover the whole zone of operation without interruption, leaving no unscraped streaks in a zone of the Width of the shaft 23.

Having thus disclosed my invention and described in detail a preferred embodiment thereof, l claim as new and desire to secure by Letters Patent:

l. A roof scraping machine having a chassis of sheet metal forming an enclosure with apertured side walls, a yoke adjustably mounted Within the enclosure and having spindles projecting out through the apertures of the side walls, wheels rotatable on the spindles on bearings located outside the enclosure of the chassis, a motor mounted on the exterior of the chassis, a transverse shaft journaled within the enclosure and driven by said motor having belt connections therewith, and a series of scraping blocks suspended from the shaft and operative on the rotation of the shaft to remove tar and gravel from the surface of a roof in a shower which is confined by the enclosure of the chassis.

2. A roof scraping machine as dened in claim l in which the chassis includes in its rear end an outwardly and downwardly inclined shield for deflecting the debris dislodged from the roof over which it passes.

3. A roof scraping machine comprising a rectangular chassis of sheet metal having parallel side walls and a laterally offset box-shaped dome in its top, a yoke mounted within thc chassis at one end thereof, journals carried by the arms of the yoke and extending outwardly through apertures in the side walls of the chassis, wheels rotatable on said journals outside the chassis, means for vertically adjusting the yoke with its wheels, a motor mounted on said done, a transverse tool shaft journaled within the chassis and beneath said dome, and belt driving connection from the motor passing to the shaft through an aperture in the chassis at one side of said dome.

References Cited in the tile of this patent UNITED STATES PATENTS 2.525,0? 3 Ensminger Oct. l0, 1950 2,606,011 Lommen Aug. 5, 1952 2,664,281 Luksch Dec. 28, 1953 FOREIGN PATENTS 5,508 Great Britain of 1906 

